It was discovered that CUPS allowed certain users to create symbolic links in certain directories under /var/cache/cups/. A local user with the 'lp' group privileges could use this flaw to read the contents of arbitrary files on the system or, potentially, escalate their privileges on the system.

As noted in MITRE's CVE request:
CVE-2014-5029 is for "if language[0] is null, we do not reach the lstat calls for filename and afterwards"
CVE-2014-5030 is for "add similar protections to the directory index
files (which are also using stat)"
index.html
index.class
index.pl
index.php
index.pyc
index.py
CVE-2014-5031 is for "if the file/directory does not have world read permissions, do not allow access..."

The original issue CVE-2014-3537 is tracked via bug 1115576.
(In reply to Vincent Danen from comment #4)
> As noted in MITRE's CVE request:
>
> CVE-2014-5029 is for "if language[0] is null, we do not reach the lstat
> calls for filename and afterwards"
>
> CVE-2014-5030 is for "add similar protections to the directory index
> files (which are also using stat)"
>
> CVE-2014-5031 is for "if the file/directory does not have world read
> permissions, do not allow access..."
Additional similar problems were identified in upstream bug report L4455. There were previously tracked via this bug report, but are now tracked via separate bugs: CVE-2014-5030 via bug 1128764 and CVE-2014-5031 via bug 1128767.

IssueDescription:
It was discovered that CUPS allowed certain users to create symbolic links in certain directories under /var/cache/cups/. A local user with the 'lp' group privileges could use this flaw to read the contents of arbitrary files on the system or, potentially, escalate their privileges on the system.